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Date:   Tue, 11 Aug 2020 11:56:25 +0530
From:   Manivannan Sadhasivam <>
To:     Bhaumik Bhatt <>
Subject: Re: [PATCH v7 00/11] Introduce features and debugfs/sysfs entries
 for MHI

Hi Bhaumik,

On Mon, Aug 10, 2020 at 03:00:54PM -0700, Bhaumik Bhatt wrote:
> Save hardware information from BHI.
> Allow reading and modifying some MHI variables for debug, test, and
> informational purposes using debugfs.
> Read values for device specific hardware information to be used by OEMs in
> factory testing such as serial number and PK hash using sysfs.
> This set of patches was tested on arm64 and x86.

Sorry for stretching the review so long. Will apply the series to mhi-next
once v5.9-rc1 is out.


> v7:
> -Added suggested-by and reviewed-by tags
> -Fixed nitpick on removal of M3_fast counter as it was unused
> -Updated sysfs documentation dates and intended kernel version
> -Fixed minor debugfs formatting by removing an extra newline character
> v6:
> -Introduced APIs for allocating and freeing the MHI controller so as to ensure
> that it is always zero-initialized
> -Moved gerrits around for counter introduction
> -Fixed documentation for sysfs
> v5:
> -Removed the debug entry to trigger reset and will be addressed in a seperate
> patch
> -Added patch bus: mhi: core: Use counters to track MHI device state transitions
> -Updated helper API to trigger a non-blocking host resume
> -Minor nitpicks also fixed
> v4:
> -Removed bus: mhi: core: Introduce independent voting mechanism patch
> -Removed bus vote function from debugfs due to independent voting removal
> -Added helper resume APIs to aid consolidation of spread out code
> -Added a clean-up patch and a missing host resume in voting API
> v3:
> -Add patch to check for pending packets in suspend as a dependency for the
> independent voting mechanism introduction
> -Include register dump entry for debugfs to dump MHI, BHI, and BHIe registers
> -Update commit message for the debugfs patch
> -Updated Documentation/ABI with the required info for sysfs
> -Updated debugfs patch to include a new KConfig entry and dependencies
> -Updated reviewed-by for some patches
> v2:
> -Added a new debugfs.c file for specific debugfs entries and code
> -Updated commit text and addressed some comments for voting change
> -Made sure sysfs is only used for serial number and OEM PK hash usage
> Bhaumik Bhatt (11):
>   bus: mhi: core: Remove double occurrence for mhi_ctrl_ev_task()
>     declaration
>   bus: mhi: core: Abort suspends due to outgoing pending packets
>   bus: mhi: core: Use helper API to trigger a non-blocking host resume
>   bus: mhi: core: Trigger host resume if suspended during
>     mhi_device_get()
>   bus: mhi: core: Use generic name field for an MHI device
>   bus: mhi: core: Introduce helper function to check device state
>   bus: mhi: core: Introduce counters to track MHI device state
>     transitions
>   bus: mhi: core: Introduce debugfs entries for MHI
>   bus: mhi: core: Read and save device hardware information from BHI
>   bus: mhi: core: Introduce APIs to allocate and free the MHI controller
>   bus: mhi: core: Introduce sysfs entries for MHI
>  Documentation/ABI/stable/sysfs-bus-mhi |  21 ++
>  MAINTAINERS                            |   1 +
>  drivers/bus/mhi/Kconfig                |   8 +
>  drivers/bus/mhi/core/Makefile          |   5 +-
>  drivers/bus/mhi/core/boot.c            |  17 +-
>  drivers/bus/mhi/core/debugfs.c         | 409 +++++++++++++++++++++++++++++++++
>  drivers/bus/mhi/core/init.c            |  81 ++++++-
>  drivers/bus/mhi/core/internal.h        |  37 ++-
>  drivers/bus/mhi/core/main.c            |  27 +--
>  drivers/bus/mhi/core/pm.c              |  26 ++-
>  include/linux/mhi.h                    |  30 ++-
>  11 files changed, 623 insertions(+), 39 deletions(-)
>  create mode 100644 Documentation/ABI/stable/sysfs-bus-mhi
>  create mode 100644 drivers/bus/mhi/core/debugfs.c
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project

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